× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: Engine ECM wont communicate with Vectronics Mastertech scanr
Posted to Technical Discussion Forum on 10/8/2009 24 Replies

[...trimmed text...]

I'd be curious of two things: 1) the MPX (multiplex communication) circuits and 2) how the piggyback system is installed.

I would check the MPX wires (Toyota offers a diagram of just this circuit) ... Login to read more.

24 Replies Received (View Replies)